NXP TEA1836XT + TEA1792T 65W笔记本适配器解决方案

NXP公司的TEA1836XT是高性能低成本DCM反激转换器控制器,所有功率水平都提供高效率和很低的功耗,输出功率高达75W,主要用在笔记本适配器,打印机,TV和计算机监视器.本文介绍了TEA1836XT通用特性,绿色特性和保护特性,应用框图,典型应用电路,以及采用TEA1836XT + TEA1792T的65 W笔记本适配器TEA1836DB1094输入和输出指标,电路图,材料清单,PCB布局图和变压器数据图.
The TEA1836XT is a high-featured low-cost DCM flyback converter controller. It provides a high efficiency at all power levels and very low no-load power consumption at nominal output voltage using burst mode operation.Burst mode is enhanced to minimize the risk of audible noise.
The TEA1836XT is intended for power supplies up to 75 W that require extended high peak power capabilities in order to supply high power without requiring a PFC.Typical applications are notebook adapters, printers, TVs or computer monitors.
The TEA1836XT is a controller IC for low-cost Switched Mode Power Supplies (SMPS) intended for flyback topologies. The built-in green functions provide high efficiency at all power levels.
At high power levels the flyback operates in QR mode. When lowering the power levels, the controller switches to DCM or Frequency Reduction (FR) mode. The peak current is reduced to 25 % of the maximum peak current.
At low power levels, when the flyback switching frequency reaches 25 kHz, the flyback converter switches to burst mode. To ensure high efficiency at low power and excellent no-load power performance, a burst mode has been integrated that reduces the optocurrent to a minimum level. As the switching frequency in this mode has a minimum value of 25 kHz while the burst frequency is always below 800 Hz, the frequencies are outside the audible range.
During the non-switching phase of the burst mode, the internal IC supply current is reduced to further optimize efficiency.Valley switching is used in all operating modes.
The TEA1836XT includes an OverPower Protection (OPP). The OPP enables the controller to deliver...